I am 8 weeks pregnant and recently fainted. Fall was not severe though n just sat down. My body was aching the next day and was feeling extreme fatigue. Should I be concerned?

Dont worry dear, just take enough rest.

Baby is too small to take damage at this point. Don't worry too much about it until you experience pain in abdomen or any sort of bleeding. Consult with a doctor if you are unable to stop worrying about this.